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Segments - Depreciation, Amortization and Accretion, Capital Expenditures, Interest Income, Interest Expense and Net Equity in Earnings (Losses) of Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs $ 365 $ 312 $ 1,056 $ 945 $ 945
Capital Expenditures Total 1,815 1,841 4,422 5,694  
Interest income 76 119 215 312  
Interest expense 348 379 1,042 1,125  
Net equity in earnings (losses) of affiliates 1 (9) (55) (21)  
Operating Segments [Member] | Renewables          
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs 146 103 413 340  
Capital Expenditures Total 1,416 1,375 3,472 4,088  
Interest income 26 30 67 90  
Interest expense 123 99 373 309  
Net equity in earnings (losses) of affiliates 4 7 (11) 29  
Operating Segments [Member] | Utilities          
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs 133 119 388 342  
Capital Expenditures Total 369 367 861 1,229  
Interest income 2 2 8 9  
Interest expense 72 75 226 223  
Net equity in earnings (losses) of affiliates 2 1 6 4  
Operating Segments [Member] | Energy Infrastructure          
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs 84 88 248 256  
Capital Expenditures Total 24 86 77 342  
Interest income 39 80 121 193  
Interest expense 71 120 221 381  
Net equity in earnings (losses) of affiliates 1 0 8 5  
Operating Segments [Member] | New Energy Technologies          
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs 0 0 1 1  
Capital Expenditures Total 2 3 5 7  
Interest income 2 2 6 5  
Interest expense 0 0 0 0  
Net equity in earnings (losses) of affiliates (3) (6) (47) (34)  
Corporate, Non-Segment | Corporate Other And Other          
Segment Reporting Information [Line Items]          
Depreciation, amortization, and accretion of AROs 2 2 6 6  
Capital Expenditures Total 4 10 7 28  
Interest income 7 5 13 15  
Interest expense 82 85 222 212  
Net equity in earnings (losses) of affiliates $ (3) $ (11) $ (11) $ (25)